Passive Wideband Interferometer Enabled Error Feedback Transmitter

Abstract

Researchers at the University of California, Davis have designed a high spectral purity error feedback transmitter.

Full Description

Increasing data rates in wireless communications requires a wider, more efficient spectrum. Feedback loops improve the linearity of a signal but increase the linearity requirements for the feedback. Current communication systems use complex modulation schemes that, due to the indirect correlation between signal gain and distortion, result in a high signal peak-to-average power ratios and stringent noise emission requirements. Therefore, there is a need to design a circuit that can cancel the feedback signal and leave high spectral purity feedback information.

Researchers at the University of California, Davis have developed a passive wideband interferometer enabled error feedback transmitter with high spectral purity. The passive wideband interferometer allows for suppression of signal distortion while maintaining signal gain capabilities, preserving linearity in a feedback loop. This design also suppresses noise created by the loop gain and can suppress a signal before it is fed into the circuit.

Applications

• Error feedback transmitter

Features/Benefits

• Decouple signal gain from error suppression
• Suppress noise
• Suppress nonlinearity with a higher gain
• Support high linear output power

Patent Status